Module: RedisCopy

Defined in:
lib/redis-copy/strategy/classic.rb,
lib/redis-copy.rb,
lib/redis-copy/ui.rb,
lib/redis-copy/cli.rb,
lib/redis-copy/version.rb,
lib/redis-copy/strategy.rb,
lib/redis-copy/key-emitter.rb,
lib/redis-copy/ui/auto_run.rb,
lib/redis-copy/ui/command_line.rb,
lib/redis-copy/key-emitter/keys.rb,
lib/redis-copy/key-emitter/scan.rb,
lib/redis-copy/strategy/dump-restore.rb

Overview

The Classic strategy borrows heavily from the utils/redis-copy.rb found in Redis source, which is also the inspiration for this gem.

#REDIS/utils/redis-copy.rb - Copyright © 2009-2010 Salvatore Sanfilippo. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright
  notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
  notice, this list of conditions and the following disclaimer in
  the documentation and/or other materials provided with the
  distribution.
* Neither the name of Redis nor the names of its contributors may
  be used to endorse or promote products derived from this software
  without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Defined Under Namespace

Modules: KeyEmitter, Strategy, UI Classes: CLI

Constant Summary collapse

VERSION = 
'1.0.0'

Class Method Summary collapse

Class Method Details

.copy(source, destination, options = {}) ⇒ Object

Parameters:

  • source (String)
  • destination (String) 


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# File 'lib/redis-copy.rb', line 18

def copy(source, destination, options = {})
  ui = UI.new(options)

  source = redis_from(source)
  destination = redis_from(destination)

  ui.abort('source cannot equal destination!') if same_redis?(source, destination)

  key_emitter = KeyEmitter.new(source, ui, options)
  strategem = Strategy.new(source, destination, ui, options)

  dest_empty = !(destination.randomkey) # randomkey returns string unless db empty.

  return false unless ui.confirm? <<-EODESC.strip_heredoc
    Source:      #{source.client.id}
    Destination: #{destination.client.id} (#{dest_empty ? '' : 'NOT '}empty)
    Pattern:     #{options[:pattern]}
    Key Emitter: #{key_emitter}
    Strategy:    #{strategem}
  EODESC

  ui.abort('Destination not empty!') unless dest_empty or options[:allow_nonempty]

  key_emitter.keys.each_with_object(Hash.new {0}) do |key, stats|
    success = strategem.copy(key)
    stats[success ? :success : :failure] += 1
    stats[:attempt] += 1

    unless success
      ui.notify("FAIL: #{key.dump}")
      ui.abort if options[:fail_fast]
    end

    probably(options[:verify]) do
      if strategem.verify?(key)
        stats[:verified] += 1
      else
        stats[:borked] += 1
        ui.notify("BORK: #{key.dump}")
        ui.abort if options[:fail_fast]
      end
    end

    ui.notify("PROGRESS: #{stats.inspect}") if (stats[:attempt] % 1000).zero?
  end.tap do |stats|
    ui.notify("DONE: #{stats.inspect}")
  end
rescue Implements::Implementation::NotFound => e
  ui.notify(e.to_s)
  ui.abort
end